to be unsustainable.

Again, in the very pamphlet in which Mr Spencer defends himself against
the supposition of being a disciple of M. Comte ("The Classification of
the Sciences," p. 37), he speaks of "M. Comte's adherent, Mr Buckle."
Now, except in the opinion common to both, that history may be made a
subject of science, the speculations of these two thinkers are not only
different, but run in different channels, M. Comte applying himself
principally to the laws of evolution common to all mankind, Mr Buckle
almost exclusively to the diversities: and it may be affirmed without
presumption, that they neither saw the same truths, nor fell into the
same errors, nor defended their opinions, either true or erroneous, by
the same arguments. Indeed, it is one of the surprising things in the
case of Mr Buckle as of Mr Spencer, that being a man of kindred genius,
of the same wide range of knowledge, and devoting himself to
speculations of the same kind, he profited so little by M. Comte.

These oversights prove nothing against the general accuracy of Mr
Spencer's acquirements. They are mere lapses of inattention, such as
thinkers who attempt speculations requiring that vast multitudes of
facts should be kept in recollection at once, can scarcely hope always
to avoid.

[8] We refer particularly to the mystical metaphysics connected with the
negative sign, imaginary quantities, infinity and infinitesimals, &c,
all cleared up and put on a rational footing in the highly philosophical
treatises of Professor De Morgan.

[9] Those who wish to see this idea followed out, are referred to "A
System of Logic, Ratiocinative and Inductive." It is not irrelevant to